#1B377B#1B377B

#1B377B is a dark, vivid blue. Relative luminance 0.044; OKLCH L 35.8% C 0.121 H 264.3°. Best body text is #FFFFFF at 11.18:1 contrast (WCAG AA passes).

Color values

HEX	#1B377B
RGB	rgb(27, 55, 123)
HSL	hsl(223, 64%, 29%)
HSV	hsv(223, 78%, 48%)
CMYK	cmyk(78%, 55.3%, 0%, 51.8%)
CIE-LAB	lab(24.94, 15.67, -41.77)
CIE-LCH	lch(24.94, 44.61, 290.57°)
OKLab	oklab(35.85% -0.0121 -0.1203)
OKLCH	oklch(35.85% 0.121 264.3)
XYZ	xyz(5.3921, 4.3949, 19.2992)
Luminance	0.0440 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B377B #7B5F1B

analogous

#1B677B #1B377B #2F1B7B

triadic

#1B377B #7B1B37 #377B1B

tetradic

#1B377B #7B1B67 #7B5F1B #1B7B2F

square

#1B377B #7B1B67 #7B5F1B #1B7B2F

split-complementary

#1B377B #7B2F1B #677B1B

monochromatic

#060B19 #102149 #1B377B #264DAD #3C69D4

Accessibility & contrast

On white

11.18

#1B377B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1B377B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B377B

11.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B377B	#FFFFFF	#000000	##FFFFFF
##1B377B	1.00	11.18	1.88	11.18
#FFFFFF	11.18	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#04407D

Deuteranopia (green-blind)

#00377A

Tritanopia (blue-blind)

#004853

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b377b;
/* rgb */ color: rgb(27, 55, 123);
/* oklch */ color: oklch(35.8% 0.121 264.3);

Tailwind

colors: {
  custom: {
    50: '#676da2',
    500: '#1b377b',
    950: '#000000',
  },
}

SCSS

$custom: #1b377b;
$custom-light: #676da2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b377b",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 123
  },
  "hsl": {
    "h": 222.5,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.35846,
    "c": 0.12089,
    "h": 264.3
  },
  "luminance": 0.04395
}

Semantic roles & 50–950 ramp

primary

#1B377B

secondary

#AF8F43

accent

#B741E7

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B377B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →